MaplePrimes - Questions and Posts tagged with simulation

Simulation end time tf in Maplesim

Alger — Thu, 26 Apr 2012 17:19:35 Z

Hi,

I have tf=0.04s but the probe plot only 0.02s at one simulation, 0.03s for another simulation ! How to oblige the probe to plot from 0s to 0.04s ?

Thanks

simulation end time

xumin — Wed, 11 Apr 2012 12:46:08 Z

Hi all,

I set the simulation end time t_f=5000s,but after running the model,the result can just simulate to 2500s.I don't kown what has gone wrong.There is a power function in the model.When the power is set as 3,the end time can just as long as 2500 second.that is to say,the result show not greater than 2500 second.When the power is set as any other number,4 for example,it can simulate 5000 second.

please help me .

Repeating Look-up Tables

rwong1231 — Thu, 05 Apr 2012 01:26:48 Z

Hmmm, I'm not sure if this possible but worth asking...and maybe useful for creating custom loop simulations:

I have a trajectory profile (via 1D Lookup Table in MapleSim) whose duration is for 10 seconds.

Is it possible to create a simulation with an end time greater than 10 seconds and have the 1D Lookup Table repeat its profile after it ends:

Example: Simulation end time = 20second. Thereby having the Lookup Table execute twice.

Suggestions on approach? Thanks.

Using previous states/parameters during simulation

onder — Mon, 02 Apr 2012 18:59:55 Z

Hi all,

During simulation I need to use a parameter as a feedback, which is previously determined in a Modelica Custom Component. In this case, can we use Zero Order Hold (ZOH) block/function to hold the previous value? If yes, how should we choose the parameters of ZOH?

Thanks

Multibarrier Problem - Schroedinger

fk08 — Mon, 19 Mar 2012 21:57:54 Z

Dear all,

I am trying to simulate the penetration of the wavefunction into a potential barrier consisting of two barrier steps of different heights, V1 and V2.

My code looks like that:

> restart;
> m := 0.91e-30;h := 0.1055e-33; V1 := 10*0.16e-18; V2 := .8*V1;a := 0.10e-9;En := .6*V1; w := En/h;
...

how can we design a wind turbine and simulate it?

abdulahaad — Sun, 05 Feb 2012 09:52:02 Z

How can we design a wind turbine and simulate it?

`Main.'Typesetting:-mambiguous'` Error

Behzad — Wed, 01 Feb 2012 16:52:17 Z

Hello,

I have created a MapleSim model including a few custom components. When I try to run the simulation, I receive the following error:

cannot resolve function `Main.'Typesetting:-mambiguous'`; there is no function `'Typesetting:-mambiguous'` visible in model `Main`

How do I know where the source of the error is?

Thank you,

Behzad

Running parameter space searches

rwong1231 — Wed, 25 Jan 2012 04:18:36 Z

Hi everyone,

In MapleSim, I know that after running a model simulation, one can save the data via 'export data in excel or csv' format...

But is it possible to automate this process via a script? For example, if I wanted to see what the model data looks like by varying one parametere between 10 to 50?

Example:

for i = 1:50

variable_in_model = i;

run MapleSim model;

save MapleSim model data;

Simulation failed

Serge-R — Sun, 22 Jan 2012 20:06:10 Z

Bonjour

Je n'arrive pas à faire fonctionner un montage simple.

J'ai un message d'erreur : (in dsolve/numeric/RunSimulation) unable to compile, please check your options by running with infolevel [ToExternal]:=1; simulation failed.

Que dois-je faire ?

Windows 7 64bits / Maple 61bits

Merci

Simulation economy challenge in Maple

Christopher2222 — Mon, 16 Jan 2012 14:47:57 Z

I'm suggesting a challenge to someone who can create a simulation in Maple on a local economy when a large supercenter enters, first, a localized small area (town), then the effect on a much larger population (state / country / etc...). A sort of local vs. large businesses.

I would like to create a business model that shows the eventual crash of rich economies due to the increased reliance on foreign imports from poor economies. As an example, perhaps...

Grid or Thread (parallel programig)

arzualtin — Fri, 06 Jan 2012 19:48:51 Z

I want to ask a question about parallel programming capability of Maple (for Maple15). I have a 4-core PC (intel i7 processor) running under Windows-7(64-bits). I'm making a monte carlo simulation by using maple15. The simulation is very complicated such that it includes loops and inside these loops we use Newton-raphson method (a numerical algorithm). Because of being complicated iterative calculations, one simulation needs approximately 50 hours to be completed. And this...

Why do my friends have more friends than I do?

Robert Israel — Fri, 25 Nov 2011 00:52:38 Z

My daughter the psychiatrist recently shared a link with me that mentioned a factoid about Facebook: "84 per cent of people think their friends have more friends than they do". Actually they don't just think this: for 84 percent of Facebook users, the median friend count of their friends is higher than their own friend count, according to

simulation a non linaire expression

ilehi — Sat, 15 Oct 2011 11:47:50 Z

I have a complex nonlinear long term, I have not found a way to simulate this expression,how I can apply the method of least squares

Pushing dsolve to its limits

PatrickT — Fri, 19 Aug 2011 23:27:30 Z

And so with this provocative title, "pushing dsolve to its limits" I want to share some difficulties I've been having in doing just that. I'm looking at a dynamic system of 3 ODEs. The system has a continuum of stationary points along a line. For each point on the line, there exist a stable (center) manifold, also a line, such that the point may be approached from both directions. However, simulating the converging trajectory has proven difficult.

I have simulated as...

How can I perform a fractional derivative in MapleSim?

ekyam — Thu, 28 Jul 2011 17:30:08 Z

Hi,

I'm trying to get a component to perform a Fractional Derivative in MapleSim to use in a multibody simulation (as a spring-dash pot component). However, I'm stumped by trying to get the fracdiff function past the custom component code.

When set to series, the fractional derivative is only accurate near the estimated about point
When set to LaPlace, it's impossible to perform the transform...